From their location in the heart of Detroit, Michigan, the Weisfelds’ lab has reached out for thirty years to couples in long-term partnerships around the world. In living rooms in Detroit, London, Moscow, Beijing, and beyond, couples of all types and ages have shared their perspectives into adult romantic relationships. The Psychology of Marriage: An Evolutionary and Cross-Cultural View is a distillation of these findings, which have appeared in dozens of book chapters, journal articles, and conference presentations. This book provides new systematic comparisons that offer insights into the mysteries of marriage and other committed relationships. Scholars, professional counselors, and family therapists will find a helpful framework in the text for thinking about cultural similarities and differences in marital dynamics. Researchers will be introduced to a robust new instrument, the Marriage and Relationship Questionnaire (MARQ), which can be used in heterosexual and same-sex couples in virtually any cultural setting, along with ethical guidelines for conducting this research. Anyone who is interested in why committed relationships work (or do not work) will find the book filled with compelling new information.